getSource2

-- print modulation sources
function printSource(source)
    if source.source == ModulationSource.midiControl then
        print("MIDI Ctrl, Controller Number: "..source.info1)
    elseif source.source == ModulationSource.quickControl then
        print("Quick Ctrl, Layer: "..source.info1.name..", QC Index: "..source.info2)
    elseif source.source == ModulationSource.modulationModule then
        print("MIDI Module,  Module: "..source.info1.name..", Output: "..source.info2)
    elseif source.source == ModulationSource.noteExpression then
        print("Note Expression, Custom NE: "..source.info1)
    elseif source.source == ModulationSource.sampleAndHold then
        print("Sample & Hold, Index: "..source.info1)
    else
        print("Standard Modulation, Index: "..source.source)
    end
end

-- get the element object of the first zone
zone = this.program:findZones(true)[1]

-- run through all 32 modulation rows of the zone and print source2 if assigned
for i=1, 32 do
    local modRow = zone:getModulationMatrixRow(i)
    local source2 = {}
    source2.source, source2.info1, source2.info2 = modRow:getSource2()
    if source2.source ~= ModulationSource.unassigned then
        print("Modulation Row "..i..", Source 2:")
        printSource(source2)
    end
end